TrailRunSim is a trail running simulator that helps you plan realistic race strategies, understand elevation profiles, and manage cutoff risks. You can start immediately by selecting one of the preset trail races — no GPX file required.
Most runners begin by choosing a preset course. These presets include popular domestic and international trail races with pre‑loaded distance, elevation, and aid station information. The simulator automatically calculates pace, predicts cutoff risks, highlights difficult sections, and estimates aid station arrival times.
If you want to analyze your own custom route, you can upload any GPX file. The simulator will generate an elevation profile, effort‑based pace estimation, cutoff risk prediction, and section‑by‑section difficulty. GPX upload is optional — the simulator works perfectly with presets alone.